Suction pipe



Sept. 2, 1930. RISLEY Re. 17,791

SUCTION PIPE Original Filed April 10. 1925 )(hvenfor. E/fan fP/s/ey.

dMforney.

ed whereby its suction end Reissued Sept. 2 193C! PATENT OFFICE ELTON BISLEY, OF VENTNOB,,.NEW JERSEY su'orron 'rrrn Original 110. 1,631,761, dated June 7, 1927, Serial 110..

filed June 27, 1928.

This invention relates to suction pipes and dredging apparatus of the general type disclosed in U. S. Patent No. 780,027, dated Jan-, uary 17, 1905, and one of the objects of the present invention is to provide a pipe of this general type so constructed and suspended as to be thoroughly practicable both as to performance and cost of manufacture.

A further object of the invention is to provide a pipe of this type which is capable of efficient use in dredging mud and the like by so suspending it that it-is yieldingly supportmay swing laterally with freedom to compensate for side thrust due to cave-ins or other causes.

A still further object of the invention is to materially increase the eiiiciency over pipes of this type as previously constructed.

In the attached drawings: I Figure 1 is a side elevation of a pipe made in accordance with my invention showing the pipe immersed-in water;

Fig. 2 is a vertical section through the pi e;

llig. 3 is a section on the line 33, Fig. 2; an

Fig. 4 is an end view from the lower end of the pipe.

With reference to the drawings, the suction pipe comprises a main suction duct 1 having an open-ended outer shell 2 forming a pas sage on the outside of the duct 1 through which, when suction is applied to the'upper end of the said duct, the water is caused to circulate, whereby water enterin the top of said outer passage is projected ownwardly against the surface toward which the suction ipe 1 is directed. A suction pipe of this general character is disclosed in the aforesaid U. S. Patent No. 780,027.

In the present instance, that portion of the pipe 1 enclosed by the shell 2 is stopped short of the lower end of the pipe, and is flared outwardly, as illustrated at 1 in Fig. 2, so as to reduce the effective area of the said outer passage at its lower end. Similarly the flaring enlarges the main duct at that point. For general purposes, it is desirable to make the cross sectional area of the outer channel at least as great as that of the main to about one-half of .the'present instance, I

grid to prevent 'sive to manufacture.

nection or suction hose 5, as

22,159, filed April 10, 1925. Application for reissue Serial no. 288,745.

suction pipe 1, and good results have been obtained when the outer channel 2 is reduced at the bottom in the manner described the area of the main suction pipe. Reduction of the effective area of the outer channel in this manner has the effect of increasing the velocity of the water assing therethrough so that the scouring effect of thiscirculating stream upon the surface or material against which the suction pipe is directed is materially increased. In have provided at the topof the shell 2 a series of bars 3 extending from the upper edge of the shell to the side of the suction pipe 1, and functioning as a solid material being taken in and clogging up the lower reduced portion of the channel. r

Ithas been necessary heretofore, in order that pipes of this general character he capableof withstanding the blows and strains to which they are subjected in certain types of work, to make them extremely heavy, with the result that they became cumbersome and extremely diflicult to handle, and also expen- Further, by reason of the excessive weight, it was found that the pipe when not suspended vertically from a flexible support, became inoperative when any considerable amount of mud was encountered. I have discovered means whereby pipes of this character may be so made as to be entirely workable in mud, where they are particularly useful, and as to eliminate the necessity for the very heavy construction heretofore required. In practicing the invention, I suspend the pipe 1 with its attached shell 2 from an elbow 1 by means of a flexible conillustrated, in Fig. 1, the latter beingsecured in any suitable manner'to the said elbow 4 and the pipe 1, in the present instance by means of clamps 6, 6. As illustrated, the suction pipe normally hangs in a practicall 7 vertical position, and through the flexible suspension 5 is free to move in any direction, when hit by a heavy cave-in of material, without being broken. By reason of this freedom of movement, it is practicable'to make the pipe 1 and shell the invention. Thus for terial whether the shell 2 g or only partly around the duct '1,'-anc*l*"thevised embodies the features of advantage enumerated as desirable,

2 of comparatively light material, and provide a device which is highlyefficient when large percentages of mud are encountered.

It will be apparent thatthe pipe is capable of material modification over the herein described and illustrated-embodiment without departure from the essential features of example it is immaextends completely as the same are susceptible of modification n various particulars without departing from the @spiritor scopeof the invention. I claim: 1. A suction pipefor'hydraulic dredging operations'comprisingamain duct, an auxiliary duct of pproximately the same cross cured tovone side of v tending upwardly from the transverse bottom plane of the main duct to a. point subsectional area" surrounding said main duct, beingopen at both ends and terminatingzadjacentthezlower endof the main duct in :a section of reduced iarea less 'than'the area ofithe-main duct, and

a grid protecting the upper end :of the auxiliary duct. I z

'02. A suction pipe for dredging comprisingamain suctionsduct; an auxiliary duct secured to one side of said main duct and extenmng; upwardly from the transverse bottom "plane of the main duct to a point substantially adjacent the topthereofzgand a 'fiarein oneside of the wall of the main duct, within the auxiliary duct, said flaredrwall terminating at a point. above the coincident bottom planes of said main ductgand said auxiliary duct, whereby the area of themain duct is increased and the area of the auxiliary duct. is reduced,\for the purpose of inducing. a, downward flow through the auxil-v viary duct, intensifying saidfiowat the point of contact with the material to be removed, and directing such intensifiedflow against a comparatively small area of such material. 3. Asuction'pipe fordredging, comprising a main suction duct; an auxiliaryduct sesaid main" duct and .ex-

stantially adjacent the toplthereof; a, flare in onesideof the wall of the main duct, within the auxiliary duct, saidflared wall terminating at a point above the coincident bottom w a 4.7 A suction particu auxiliary duct secured to one as its upper portion as pro-- vi ded in thegmain' ductland substantially continuous;:throughoutits length and partially planes of said main duct and said auxiliary duct, whereby the area of the main duct is increased and the area of the auxiliary duct is reduced, for the purpose of inducing a downward flow through the auxiliary duct, intensifying said flow at a point of contact with the material to be removed, and directing such intensified flow against a comparatively small area of such material; and a grid cover ingthe upper-inle't ehd of said auxiliary duct.

pipe for dredging, avertically arranged main suction duct; an side of said main ductand extending from the transverse bottom plane of the main duct upwardly to a pointrsubstantially ad-jacentthetop thereof a flare in .one side oi the wall .ofthe main ,duct, within the auxiliary duct, said "flared wall terminating at a point above the coincicomprising dentibottom planesof saidmain duct andsaid auxiliary duct, whereby the area of the main ductis increased'and the area of the auxiliary duct is-reduced, for the purpose of inducing a downward flow; through the auxiliary duct, intensi 'ying said flow at the point of contact with the material to be removed, and directing such intensified'flow against a comparaof such material; and a tively small area flexible; supporting connector secured to the upper end of saidvertical main duct whereby said suction pipe as awholeis suspended substantially vertical and permitted free lateral movement; in all directions Lat its lower end. i

5. A suction pipe for dredging, amain suction ductopen at its lower end; an auxiliary water guiding'duct secured to one side of the; said main duct and extending from comprising 1'" the level of the bottom of the main duct upwardly tolavleveladjacent to the top thereof 5 and also open at the top and bottom, the said main duct and auxiliary duct having' relative shapeswhereby the lower portionof the mainduct flares downwardly withran increase in its crosssectional area and the auxiliary duct adja'centuto its loweror bottom portion tapersin .a downwardly direction whereby its cross sectional area is decreased toless than the cross sectional area of the main duct for thepur pose of inducing a positivedownward water flow through the auxiliary duct andrintensifying said flow at the point of contact with the materialto be removed through the 'main suction duct anddirecting such intensified flow against a comparatively small varea of such material for loosening it.

6. In dredging apparatus, a suction conduit having an open end shaped to extend downwardly to provide a stationary support, .in

combination with a suction pipe having its upper end arranged below andoutof contact with the downwardly extending lower end of the suction conduit and in normal vertical alignment therewith, said suction pipe movable bodily and laterally with respect to the relatively stationary suction conduit support, and a vertical flexible tubular connecting duct having its upper end positively connected to the relatively stationary support formed by the lower open end of the suction conduit and suspended therefrom and also extending vertically downward with its lower end closely connected to the open top of the suction pipe, said flexible tubular connecting duct being of considerable length and flexibility to permit the suction pipe bodily to shift laterally about the vertical axis of the relatively stationary end of the suction conduit and body of the suction pipe to be freely movable at various angles in all lateral directions under the influence of shifting material to be removed and to be normally suspended in'a vertical direction from the suction conduit when relieved from abnormal lateral pressure.

ELTON RISLEY. 

